RDr..Interesting report. Althou kinda odd (for me) Delo 15W/40 not tested? Have you considered asking shell about this report & findings? My guess is they would respond, just a thought. Chevron tec. answered Q's I had about their delo. especially interesting on why adding additives not a good idea. change's chemistry etc. etc.
btw..this test
LUCAS OIL additive is dated, but might be reason enough not to use in ANY brand? Like the man said..draw your own conclusions. RT report also surprised me.
